Hi Minchan, On 2016/6/13 15:50, Minchan Kim wrote: > Hi all, > > http://thread.gmane.org/gmane.linux.kernel/1480728 > > I sent per-process reclaim patchset three years ago. Then, last > feedback from akpm was that he want to know real usecase scenario. > > Since then, I got question from several embedded people of various > company "why it's not merged into mainline" and heard they have used > the feature as in-house patch and recenlty, I noticed android from > Qualcomm started to use it. > > Of course, our product have used it and released it in real procuct. > > Quote from Sangwoo Park <angwoo2.p...@lge.com> > Thanks for the data, Sangwoo! > " > - Test scenaro > - platform: android > - target: MSM8952, 2G DDR, 16G eMMC > - scenario > retry app launch and Back Home with 16 apps and 16 turns > (total app launch count is 256) > - result: > resume count | cold launching count > ----------------------------------------------------------------- > vanilla | 85 | 171 > perproc reclaim | 184 | 72 > " > > Higher resume count is better because cold launching needs loading > lots of resource data which takes above 15 ~ 20 seconds for some > games while successful resume just takes 1~5 second. > > As perproc reclaim way with new management policy, we could reduce > cold launching a lot(i.e., 171-72) so that it reduces app startup > a lot. > > Another useful function from this feature is to make swapout easily > which is useful for testing swapout stress and workloads. > Thanks Minchan.
Yes, this is useful interface when there are memory pressure and let the userspace(Android) to pick process for reclaim. We also take there series into our platform. But I have a question on the reduce app startup time. Can you also share your theory(management policy) on how can the app reduce it's startup time? > Thanks. > > Cc: Redmond <u93410...@gmail.com> > Cc: ZhaoJunmin Zhao(Junmin) <zhaojun...@huawei.com> > Cc: Vinayak Menon <vinme...@codeaurora.org> > Cc: Juneho Choi <juno.c...@lge.com> > Cc: Sangwoo Park <sangwoo2.p...@lge.com> > Cc: Chan Gyun Jeong <chan.je...@lge.com> > > Minchan Kim (3): > mm: vmscan: refactoring force_reclaim > mm: vmscan: shrink_page_list with multiple zones > mm: per-process reclaim > > Documentation/filesystems/proc.txt | 15 ++++ > fs/proc/base.c | 1 + > fs/proc/internal.h | 1 + > fs/proc/task_mmu.c | 149 > +++++++++++++++++++++++++++++++++++++ > include/linux/rmap.h | 4 + > mm/vmscan.c | 85 ++++++++++++++++----- > 6 files changed, 235 insertions(+), 20 deletions(-) >
